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Performance of a biological degradation method for indoor formaldehyde removal

机译：一种生物降解方法去除室内甲醛的性能

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摘要

Formaldehyde is a common gaseous pollutant affecting the indoor air quality and the health of occupants in buildings. Various technologies have been tried, such as adsorption, photocatalytic oxidization and botanical flltrations. However, the removal of indoor formaldehyde is still a challenging problem due to the low rate, byproduct formation and low efficiency of the above mentioned methods. Biological degradation technology with high removal efficiency has been successfully applied in industries for effluents and waste gas treatments. However, the potential biohazard risk from possible microorganism leakages of the biological system is the biggest concern of indoor air biofiltration systems. This study investigated the performance of a biological degradation system for formaldehyde removal at typical indoor condition. A microbial immobilization method was applied in the biofiltration system to reduce the potential biohazard risk. Bacterial strain of Pseudomonas putida was embedded in calcium alginate gel, which was then formed to a novel packing material called microbial granules. To investigate the operating performance of the biofilter in practical indoor environment, the concentrations of experimental inlet formaldehyde was controlled between 0.222 and 1.339 mg m~(-3), while the corresponding removal efficiency of the biofilter system varied from 68.6% to 93.5%. The pressure drop was maintained at 120 Pa with air flow rate increased up to 1.5 L min~(-1). The effect of inlet concentration, empty bed residence time, and nutrient feeding rate on the performance of the system was investigated as well. No microbial leakages were detected at air downstream during the experimental study, while the high microbial activity of bacteria entrapped in the packing material was observed.
机译：甲醛是一种常见的气态污染物，会影响室内空气质量和建筑物中居民的健康。已经尝试了各种技术，例如吸附，光催化氧化和植物过滤。然而，由于上述方法的低速率，副产物形成和低效率，去除室内甲醛仍然是一个具有挑战性的问题。具有高去除效率的生物降解技术已成功应用于废水和废气处理行业。然而，由生物系统可能的微生物泄漏引起的潜在生物危害风险是室内空气生物过滤系统的最大关注。这项研究调查了在典型室内条件下生物降解系统去除甲醛的性能。在微生物过滤系统中采用了微生物固定方法，以减少潜在的生物危害风险。将恶臭假单胞菌的细菌菌株包埋在藻酸钙凝胶中，然后将其形成一种称为微生物颗粒的新型包装材料。为了研究生物滤池在实际室内环境中的运行性能，将实验入口甲醛的浓度控制在0.222至1.339 mg m〜（-3）之间，而生物滤池系统的相应去除效率则从68.6％到93.5％。压降保持在120 Pa，空气流量增加到1.5 L min〜（-1）。还研究了进料浓度，空床停留时间和养分进料速率对系统性能的影响。在实验研究期间，在下游空气中未检测到微生物泄漏，同时观察到包裹在包装材料中的细菌具有很高的微生物活性。

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  • 来源
    《Building and Environment》 |2012年第11期|p.253-258|共6页
  • 作者

    Nan Lu; Jingjing Pei; Yixuan Zhao; Ruiying Qi; Junjie Liu;

  • 作者单位

    School of Environmental Science and Engineering, Tianjin University, Weijing Road 92, Tianjin 300072, China;

    School of Environmental Science and Engineering, Tianjin University, Weijing Road 92, Tianjin 300072, China;

    School of Environmental Science and Engineering, Tianjin University, Weijing Road 92, Tianjin 300072, China;

    School of Environmental Science and Engineering, Tianjin University, Weijing Road 92, Tianjin 300072, China;

    School of Environmental Science and Engineering, Tianjin University, Weijing Road 92, Tianjin 300072, China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    formaldehyde; indoor air quality; biodegradation; biofiltration system; microbial immobilization;

    机译：甲醛;室内空气质量生物降解生物过滤系统;固定微生物;

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